Cylinder-grinding attachment for lathes



W. T. SNELL.

CYLINDER GRINDING ATTACHMENT FOR LATHES..

APPLICATION FILED JAN. 31, 1919.

1 35,994, Patented Apr. 6, 1920.

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CYLINDER GRINDING ATTACHMENT FOR LAITHES.

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ATTORNEYS Patented Apr. 6, 1920 Z SHEETSHEET 2 APPLICATION FILED JAN. 31, 1919.

WITNESSES Manama 1 WILLIAM T. SNELL, OF EL PASO, TEXAS.

CYLINDER-GRINDING ATTACHMENT FOR LATHES.

Application filed January 31, 1919.

To all whom it may concern:

Be it known that 1, WILLIAM T. SNELL, a

. citizen of the United States, and a resident of El'Paso, in the county of El Faso and State of Texas, have invented new and useful Improvements in Cylinder-Grindin Attachments for Lathes, of which the following is a specification.

My invention is an improvement in cylinder grinding attachments for lathes, and has for its object to provide mechanism in connection with a cylinder grinder for permitting the grinding shaft to be set at an angle to the driving shaft, to provide for grinding cylinders of various sizes, and to provide mechanism in connection with the ball bearing mounting of the shaft for con1- pensating for wear.

In the drawings Figure 1 is a side view of the improved grinder in connection with a lathe,

Fig. 2 is a perspective view showing the grinding shaft and driving shaft separated,

Fig. 3 is a longitudinal section through the grinding shaft and the connection with the driving shaft,

Fig. 4 is a section on the line i--1 of Fig. 1, looking in the direction of the arrows adjacent to the line, and

Figs. 5 and 6 are sections on the lines 55, and 6-6, respectively, of Fig. 3, both views looking in the direction of the arrows adjacent to the lines.

In the present embodiment of the invention, the grinding s wit 1 is a hollow shell, having threaded into one end a head 2 to which the grinding wheel 3 is connected by a screw 4. The other end of the shaf threaded into one of the sections 5 of a housing, the said section having threaded engagement with the other section 6 which carries a pulley 7 adapted for engagement by a belt 8 to rotate the grinding shaft.

A hollow or chambered shaft 9 is jour naled in the shaft 1, the said shaft extending through the housing 5-6, and this shaft 9 carries at the housing one of the sections 10 of a ball race, the other section 11 being carried by the housing, and a series of balls 12 is arranged in the race.

A pin 13 is mounted in the chamber of the shaft 9, and the said pin extends beyond the outer end of the shaft and is provided with one of the sections 1 1 of a ball race, the other section 15 being carried by the shaft 1,

Specification of Letters Patent.

Patented Apr. 6, 1920.

Serial No. 274,250.

and a series of balls 16 is arranged within the race. This pin is normally pressed out of the chamber and toward the head 2 by a coil spring 17, and it will be evident that under the influence of the spring any wear at the ball bearing 1t1516 will be com pensated for.

Means is provided for lubricating the spring and the hearing. The said means comprises passages 18 and 19 in the pin and in the shaft 9, respectively. The passage 19 has a lateral extension 20, through which the lubricant may be supplied.

The shaft 1 is connected to a fixed shaft 21 by means of an adjustable connection.

'The said connection comprises disks or heads 22 and 23 on the shafts 9 and 21, respectively. These disks have threaded engagement with their respective shafts, and the disk 22 has that face adjacent to the disk 23 beveled in opposite directions from a dialnetrical line. The disk 23 has pins 24: on a diametrical line registering with the line from which the bevel surfaces of the disk 22 extend, and these pins engage flaring or tapering openings 25 in the disk 22. The disks are connected by bolts 26 and nuts 27, and the heads of the bolts are arranged in countersunk or reamed portions 28 of the disk 22.

It will be evident that by loosening the nut of one bolt and tightening that of the other the shafts 1 and 9 may be arranged at an angle with respect to the shaft 21. The fixed shaft 21 is held in a fixed bearing 29 on a lathe 30, and the said shaft is connected to the lathe at 31 by the mechanism shown in Figs. 3 and 5. The said mechanism comprises a pin 32 arranged diametrically of the shaft, and a plate 33 which has an opening for receiving the shaft and fits against the pin. This plate is connected by bolts 34 with the lathe and it has grooves for receiving the end of the pin 32. By tightening the bolts 34!: the shaft 21 may be firmly held to the lathe.

The shaft 1 is, as before stated. driven by the belt 8. which connects the pulley 7 with a pulley 35 on a shaft 36 arranged above the shaft 31 and journal-ed in suitable bearings 37 on the standards 38 connected with the lathe. This shaft has a pulley 39 which is connected by a belt 40 with the cone pulley 11 of the lathe. By varying the angle of the shaft 1 with respect to the shaft 21, the

grinding wheel may be used with various sizes of cylinders. This angular arrangement is shown in Fig. 1 in dotted lines.

In operation, the shaft 1 is adjusted with respect to the shaft 21 by means of the bolts 26 and the nuts 27 and is introduced into the cylinder. By adjusting the wheel to the proper point any size cylinder may be ground.

1. A cylinder grinder comprising a ho]- low shaft, a sleeve journaled thereon and carrying a grinding Wheel at one end, a head at the said end to which the wheel is secured, a pin in the hollow shaft and extending beyond the said shaft at the head and freely movable longitudinally of the shaft, a collar on the pin forming one section of a ball race, the other section being secured to the sleeve, a ball bearing in the race, and a spring between the sleeve and the inner end of the shaft.

2. In a cylinder grinder, a sleeve carry ing at one end a grinding Wheel, a hollow shaft journaled in the sleeve, a pin in the shaft, a ball bearing between the pin and the sleeve, and a spring pressing the pin in one direction to compensate for Wear on the balls of the bearing.

3. In a cylinder grinder, a grinding wheel supporting shaft, a holding shaft, a sectional connection for permitting the wheel supporting shaftto extend at an angle with respect to the holding shaft, one section of the connection being secured to each shaft and one section having the face adjacent to the other section beveled in opposite directions from a diametrical line, tapering openings in the section near the ends of the said line, pins on the other section engaging the openings, and bolts and nuts connecting the sections, said bolts being on alineat right angles to the first named line.

WILLIAM T. SNELL. 

